Specification Part 3 - Road & Bridge Works - Urban Administration ...

joints is completed including the construction of shoulder, with the written permission of the
Engineer.
602.14. Tolerances for Surface Regularity, Level, Thickness and Strength
The tolerances for surface regularity, level, thickness and strength shall conform to the
requirements given in Clause 903.5. Control of quality of materials and works shall be exercised
by the Engineer in accordance with Section 900.
602.15. Measurements for Payment
602.15.1. Cement Concrete pavement shall be measured as a finished work in square meters
with specified thickness. The volume to be paid for will be calculated on the basis of thickness
and plans shown on the project drawings and adjusted for the deficiency in thickness. No
additional payment shall be made for extra thickness of the slab. The full payment will be made to
this item after 28 days strength of the concrete is found to be satisfactory.
The unit for measurement for concrete pavement shall be the cubic meter of concrete placed,
based on the net plan areas for the specified thickness shown on the Drawings or directed by the
Engineer. The rate shall include all provisions of this Specification and shall include the provision
of all materials including polythene film, concrete, stock piling, mixing, transport, placing,
compacting, finishing, curing together with all formwork, and including testing and submission of
test certificates and records. No deduction shall be made in measurement for openings provided
that the area of each is less than 0.5 sq. m. The unit rate as entered in the Bill of Quantities shall
also include the full costs of contraction, expansion, construction, and longitudinal joints. It shall
also include joint filler, keys, caulking rod, debonding strip, sealant primer, joint sealant, dowel bar
and tie rod.
602.15.2. Pavement thickness
All precautions and care shall be taken to construct pavement having uniform thickness as called
for on the plans.
Thickness of the cement concrete pavement shall be calculated on the basis of level
data of the cement concrete-pavement and the underlying sub-base taken on a grid of 5 m x 3, 5
m or 6, 25 rri x 3.5 m, the former measurement being in longitudinal direction.
A day’s work is considered as a ’lot’ for calculating the average thickness of the slab. In
calculating the average thickness, individual measurements which are in excess of the specified
.thickness by more than 10 mm shall be considered as the specified thickness plus 10 mm.
Individual areas deficient by more than 25 mm shall be verified by the Engineer by
ordering core cutting and it in his opinion the deficient areas warrant removal, they shall be
removed and replaced with concrete of the thickness shown on the plans.
When the average thickness for the lot is deficient by the extent shown in Table 600-3,
the Contract unit price will be adjusted as per this Table.
TABLE 600-3. PAYMENT ADJUSTMENT FOR DEFICIENCY IN THICKNESS
Deficiency in the average
thickness of day’s work
Per cent of Contract
unit price payable
Up to 5 ram
6 - 10 mm
11 - 15 mm
16 - 20 mm
21 - 25 mm
100
87
SI
75
70
In the stretch where deficiency of average thickness is more than 25 mm, the section whose
thickness is deficient by 26 mm or more is identified with the help of cores. Such slabs shall be
removed and reconstructed at the cost of the Contractor, During such rectification work, care
shall be taken to replace full slab and to the full depth.